/*
   Copyright (c) 2011 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-05 Marco Riccardi - initial implementation
 *  2011-03-25 Marco Riccardi - implementation of visitor pattern
 *
 */
package org.mizartools.system.xml;

import java.util.LinkedList;

import org.mizartools.system.ElementParseException;
import org.mizartools.system.IElement;
import org.mizartools.system.INode;
import org.mizartools.utility.xml.XMLAttribute;
import org.mizartools.utility.xml.XMLElement;

public class Func extends Term implements IElement {

    public enum Kind { F, G, K, U,}

    public static final String NAME = "Func";

    private INode parentNode;
    private Kind kind = null;
    private Integer nr = null;
    private Integer absnr = null;
    private String aid = null;
    private Integer pid = null;

    private LinkedList<Term> termList = new LinkedList<Term>();


    private Func(INode parentNode){
        this.parentNode = parentNode;
    }

    public INode getParentNode() {
        return parentNode;
    }

    public static Func newInstance(INode parentNode, LinkedList<XMLElement> xmlElementList) throws ElementParseException {
        Func func = new Func(parentNode);
        XMLElement xmlElement = xmlElementList.poll();
        if (!xmlElement.getName().equals(NAME)){
            throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a " + NAME, xmlElementList);
        }
        for (XMLAttribute xmlAttribute : xmlElement.getXMLAttributeList()){
            if (xmlAttribute.getName().equals("kind")){
                if (func.kind == null){
                    if (Kind.valueOf(xmlAttribute.getValue()) != null) {
                        func.kind = Kind.valueOf(xmlAttribute.getValue());
                    } else 
                        throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
            } else 
            if (xmlAttribute.getName().equals("nr")){
                if (func.nr == null){
                    try {func.nr = Integer.parseInt(xmlAttribute.getValue());}
                    catch (Exception e) {throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);};
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
            } else 
            if (xmlAttribute.getName().equals("absnr")){
                if (func.absnr == null){
                    try {func.absnr = Integer.parseInt(xmlAttribute.getValue());}
                    catch (Exception e) {throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);};
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
            } else 
            if (xmlAttribute.getName().equals("aid")){
                if (func.aid == null){
                    func.aid = xmlAttribute.getValue();
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
            } else 
            if (xmlAttribute.getName().equals("pid")){
                if (func.pid == null){
                    try {func.pid = Integer.parseInt(xmlAttribute.getValue());}
                    catch (Exception e) {throw new ElementParseException(ElementParseException.NOT_VALID_TYPE_OF_ATTRIBUTE_ELEMENT, "XMLElement has an attribute " + xmlAttribute.getName() + " with an invalid type", xmlElementList);};
                } else {
                    throw new ElementParseException(ElementParseException.DUPLICATE_ATTRIBUTE_ELEMENT, "XMLElement has a duplicate attribute " + xmlAttribute.getName(), xmlElementList);
                } 
            } else 
                throw new ElementParseException(ElementParseException.NOT_VALID_ATTRIBUTE_ELEMENT, "XMLElement has not a valid attribute " + xmlAttribute.getName(), xmlElementList);
        }

        if (!xmlElement.isEmpty()){
            while (true){
                xmlElement = xmlElementList.peek();
                if (xmlElement == null){
                    throw new ElementParseException(ElementParseException.UNEXPECTED_END_OF_FILE, "Unexpected end of XMLElement list");
                }
                if (xmlElement.getName().equals(NAME) && xmlElement.isEndElement()){
                    xmlElement = xmlElementList.poll();
                    break;
                }
                if (Term.isTerm(xmlElement.getName())){
                    func.termList.add(Term.newInstance(func, xmlElementList));
                } else 
                    throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "The XMLElement " + xmlElement.getName() + " is not valid in " + NAME, xmlElementList);
            }
        }

        return func;
    }

    public LinkedList<XMLElement> getXMLElementList() {
        LinkedList<XMLElement> xmlElementList = new LinkedList<XMLElement>();
        XMLElement xmlElement = new XMLElement(NAME);
        if (this.kind != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("kind", this.kind.name());
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        if (this.nr != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("nr", this.nr);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        if (this.absnr != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("absnr", this.absnr);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        if (this.aid != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("aid", this.aid);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        if (this.pid != null) {
            XMLAttribute xmlAttribute = new XMLAttribute("pid", this.pid);
            xmlElement.getXMLAttributeList().add(xmlAttribute);
        }
        boolean isEmpty = !(!termList.isEmpty());
        xmlElement.setEmpty(isEmpty);
        xmlElementList.add(xmlElement);
        for (Term term : this.termList){
            xmlElementList.addAll(term.getXMLElementList());
        }
        if (!isEmpty) { 
            xmlElement = new XMLElement(NAME);
            xmlElement.setEndElement(true);
            xmlElementList.add(xmlElement);
        }
        return xmlElementList;
    }

    public Kind getKind(){
        return kind;
    }

    public Integer getNr(){
        return nr;
    }

    public Integer getAbsnr(){
        return absnr;
    }

    public String getAid(){
        return aid;
    }

    public Integer getPid(){
        return pid;
    }

    public LinkedList<Term> getTermList(){
        return termList;
    }

	@Override
	public void accept(Visitor visitor) {
		if (visitor.visit(this)) {
			for(Term term: this.termList) {
				term.accept(visitor);
			}
		}
		visitor.endVisit(this);
	}

	@Override
	public String toString(){
		ToStringVisitor toStringVisitor = new ToStringVisitor();
		this.accept(toStringVisitor);
		return toStringVisitor.toString();
	}

}
